Audio is not Working When Someone is Playing the Piano

[Linny1]

I am a piano teacher teaching students via Zoom.  Recently there has been a change with the audio setting where I can hear my students speak fine but can't hear them play the piano.  This issue is happening even when we have original sound turned on.

Any ideas what the problem may be and how to resolve this issue?

Linette

[MaryB2]

Evidently many people have this problem and Zoom has not been able to solve it!